Is there any ways that an omnidirectional microwave signal (digital) could be affected by power lines 25 feet away from the transmitter? I know any electrons moving into a conductor creates a magnetic field but could it affect a microwave signal?

Powerlines won't affect an Omni running somewhere in the GHz. In fact powerlines won't affect much in RF unless we're talking low frequencies (KHz) or HV powerlines - and they won't be 10 meters close to *anything* due to regulations.

Powerlines won't affect an Omni running somewhere in the GHz. In fact powerlines won't affect much in RF unless we're talking low frequencies (KHz) or HV powerlines - and they won't be 10 meters close to *anything* due to regulations.

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Yeah plus I'm thinking of all the RF being used by EMF's, cops etc... in a big city. That would create a mess